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Construction of IDM system is difficult due to the complexity and heterogeneity of the communication network. This research proposes a way that we can build the IDM system reliably and reasonably. The research analyzes the orientation of the IDM system's function, and then classifies the system's function into management domains, business levels and support classes. Each subdivision of three aspects is defined consequently. The research proposes the function model, the system's reference model and the system architecture of IDM, and forms a system design suggestion at last.